DLE-55RA Two-Stroke Petrol EngineProduct Features Advanced CNC machining, tight tolerances and refined porting improve compression and fuel burning efficiency to raise performance and reduce exhaust residue. Redesigned, lightened piston skirt provides better throttle response, fuel economy and resistance to wear. Included 2 stage Pitts muffler reduces back pressure and increases power. Also features a special aluminum alloy crankcase, high quality sealed crankshaft bearings and DLE